Contains: Triangulum galaxy, M 33, NGC 598
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M33 LRGB with 26 hours of OIII and Ha

Technical card

Imaging telescope or lens: Planewave CDK14

Imaging camera: SBIG STX 16803

Mount: Paramount ME II

Guiding telescope or lens: Planewave CDK14

Guiding camera: SBIG STX 16803

Software: CCDWare CCDAutoPilot 5CCDWare CCDStack 2Adobe Photoship CC

Resolution: 4009x3138

Dates: Nov. 12, 2017

Frames: 365x475"

Integration: 48.2 hours

Avg. Moon age: 23.82 days

Avg. Moon phase: 32.63% job: 1877445

RA center: 23.449 degrees

DEC center: 30.666 degrees

Pixel scale: 0.728 arcsec/pixel

Orientation: 55.548 degrees

Field radius: 0.515 degrees

Locations: Sierra Remote Observatory, Auberry, California, United States


I find the OIII rich nebulae to be the most interesting thing here. I wonder how many other galaxies would benefit by OIII data?

This image is an odd amalgamation of data from the 2016 and 2017 seasons. In 2016 I had shot quite a bit of LRGB binned 2x2 and unguided due to some guide camera issues. I added more bin 1x1 guided RGB data in November. All of the LRGB data is 300 seconds. I then started shooting Ha. Since I thought of the Ha only enhancing red color data I shot that bin 2x2 at 900 seconds. Seeing so much nebula structure I thought some OIII could help and added OIII 2x2 at 900 seconds. (see my other narrowband only post on this)

I now have 260 LRGB subs and 105 Narrowband subs with a total integration time of 46 hours. Non of the Luminance is 1x1 binned! So I guess next year I work on that....

The brightest nebulae are on the edge of saturated in Ha. I guess that's for next year too.

The Ha and OIII were added as layers in PS with a lighten blending. Ha was colored Magenta and OIII blue.



Kevin Morefield

Sky plot

Sky plot


M33 LRGB with 26 hours of OIII and Ha, 


        Kevin Morefield